Amazon advertising India reports revolve around three numbers, ACoS, TACoS and ROAS, and misreading them is one of the quickest ways to waste ad budget. A campaign can show a “bad” ACoS and still be growing a profitable business, or a “good” ACoS while the brand loses money. This guide explains what each metric measures, how to calculate it, how to set a target from your own margin and the mistakes that make dashboards misleading.
Key takeaways (The TL;DR)
- ACoS is ad spend divided by ad-attributed sales. ROAS is the same relationship the other way round: ad-attributed sales divided by ad spend. TACoS compares ad spend with your total sales, including organic.
- Amazon says there is no single good ACOS: it depends on your category, margin and campaign stage, and to stay profitable your ACOS should be lower than your margin.
- Set targets from your margin before ad spend, and track ACoS and TACoS together to see whether ads are building a healthier business, not just attributed sales.
- Check the attribution window, campaign age and branded versus non-branded split before judging any number.
Why Amazon Advertising India Metrics Get Misread
Dashboards show tidy percentages, so it is tempting to chase the lowest ACoS or the highest ROAS. But each metric answers a different question, and each ignores something. ACoS and ROAS only see sales that ads are credited with. They say nothing about your profit on those sales or about the organic sales around them. Reading them well means knowing what is, and is not, inside the number.
The Three Metrics, Explained
| Metric | Formula | What it tells you | What it hides |
| ACoS | Ad spend divided by ad-attributed sales, times 100 | How much you spend to earn each rupee of ad-attributed sales | Profit, organic sales, and the effect of ads on your wider ranking |
| ROAS | Ad-attributed sales divided by ad spend | How many rupees of ad-attributed sales each rupee of spend returned | The same gaps as ACoS, because it is its mirror image |
| TACoS | Ad spend divided by total sales (organic plus advertised), times 100 | How heavy ad spend is compared with your whole business | How much of total sales ads actually caused |
According to Amazon’s own guide to ACOS, ACOS equals ad spend divided by ad revenue, multiplied by 100, and ROAS is the inverse calculation, revenue divided by spend. Amazon’s guides do not define TACoS, so the TACoS formula above is the usual industry convention. Always confirm how your reporting tool calculates each number.
A Worked Example
These figures are illustrative only. Suppose your product sells for Rs 500 and, after product cost, Amazon fees and shipping, you keep Rs 150 before any ad spend. That is a 30 percent margin before ads.
| Item | Figure |
| Total sales in the month | Rs 10,00,000 |
| Sales credited to ads | Rs 4,00,000 |
| Ad spend | Rs 1,00,000 |
| ACoS | 25% (1,00,000 divided by 4,00,000) |
| ROAS | 4.0 (4,00,000 divided by 1,00,000) |
| TACoS | 10% (1,00,000 divided by 10,00,000) |
| Break-even ACoS | 30%, equal to margin before ads |
At 25 percent ACoS, this brand earns about 5 percent of ad-attributed sales after ad spend, before overheads. At 35 percent it would lose money on those sales, although it might still be worthwhile when launching a new product, as explained below. Amazon’s guide makes the same link: break-even ACOS is tied to profit margin, and to stay profitable your ACOS needs to be lower than your margin.
What Is a Good ACoS or ROAS?
There is no universal answer. Amazon says there isn’t a definitive number for a good ACOS and that new campaigns tend to have a high ACOS because they are new. On ROAS, Amazon’s guide to ROAS describes a 2 to 1 ratio as a rough average and suggests brands might ideally aim for around 3 or 4, while stressing that results depend on many variables. Treat both as starting points and set your own targets from margin.
- Launch phase: accept a higher ACoS to gather reviews and rank, with a defined time limit.
- Established products: target an ACoS comfortably below break-even.
- Branded searches: these usually convert cheaply, so keep them separate from non-branded terms to avoid a flattering blended average.
- Clearance or seasonal peaks: a different target may suit short windows.
How to Read the Metrics Together
| What you see | Possible reading | What to check |
| ACoS up, TACoS flat or down | Ads may be supporting healthy total growth | Total sales trend, rank and stock |
| ACoS down, TACoS up | Spending more overall, perhaps on easier terms | Whether new sales are incremental |
| ROAS high but total sales flat | Ads are mostly harvesting demand that would have come anyway | Branded share of spend, organic rank |
| Both falling after a price change | Pricing or conversion issue, not an ad problem | Price, reviews, availability |
These are possible readings, not proofs. Test changes one at a time and compare against a baseline period.
Common Mistakes When Reading Ad Metrics
- Chasing the lowest ACoS and starving growth campaigns.
- Setting targets without knowing margin before ads.
- Blending branded and non-branded results into one average.
- Comparing numbers from different attribution windows or reports.
- Ignoring stock: ads on products that go out of stock waste money and can hurt rank.
- Copying a benchmark from another seller or category.
Marketplaces and quick commerce platforms use their own names and definitions for similar metrics, including “total” variants. Ask for the exact formula behind every number on a platform report before you compare it with another platform.
How AKOI Can Help
AKOI works with D2C, FMCG and ecommerce brands across India. Our ecommerce marketing team and our PPC work cover account management, advertising and pricing support on marketplaces, and our quick commerce marketing team covers brands that sell on Blinkit, Zepto, Swiggy Instamart, Amazon Now, Flipkart Minutes and BigBasket. You can see examples in our portfolio. If you want a clear view of what your ad metrics mean for profit, talk to us.
Note: examples are illustrative. Platform metric definitions and reports change, so check current documentation. Results depend on category, budget and execution.
Frequently Asked Questions
What is ACoS on Amazon?
ACoS, or advertising cost of sales, is ad spend divided by ad-attributed sales, expressed as a percentage. A lower figure means you spend less to earn each rupee of ad-attributed sales.
What is the difference between ACoS and ROAS?
They measure the same relationship in opposite directions. ACoS is spend divided by sales, as a percentage. ROAS is sales divided by spend, as a ratio. A 25 percent ACoS equals a ROAS of 4.
What is TACoS and why does it matter?
TACoS compares ad spend with total sales, including organic. It helps show whether ad spend is a sustainable share of the business, but it does not prove that ads caused the organic sales.
What is a good ACoS for Amazon India?
There is no single number. Amazon says a good ACOS depends on industry, company size and campaign stage. Set your target from your margin before ad spend, so that ACoS stays below break-even.
How do I calculate my break-even ACoS?
Divide your profit per unit before ad spend by the selling price. If you keep Rs 150 on a Rs 500 product, break-even ACoS is 30 percent.
Why is my ACoS high on a new product?
New campaigns often show a higher ACoS while they gather data, reviews and rank. Set a time limit and a clear goal for the launch phase, then tighten the target.
Can AKOI manage Amazon advertising for my brand?
AKOI provides marketplace advertising and account management for ecommerce brands. Contact us to discuss your products and goals.